RL-1005-2-R500-FNH Equivalent & Substitute Parts

Part Overview

The RL-1005-2-R500-FNH is a 500 mOhms ±1% 0.125W (1/8W) chip resistor in 0402 (1005 Metric) package manufactured by Delta Electronics/Cyntec. This metal film current sense resistor is designed for precision low-resistance applications requiring tight tolerance and stable performance across temperature ranges from -55°C to 125°C. The part is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

RL-1005-2-R500-FNH

Delta Electronics/CyntecIn Stock: 1092RL-1005-2-R500-FNH Datasheet

Current PartRFQ

CSR1206FTR500

Stackpole Electronics IncIn Stock: 88092CSR1206FTR500 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RL-1005-2-R500-FNH is determined by the following critical parameters:

• Resistance Value: 500 mOhms exact match required
• Tolerance: ±1% minimum requirement
• Temperature Coefficient: ±100ppm/°C or better
• Application Type: Current sense functionality
• Compliance: ROHS3 and REACH compliance maintained

The substitute part CSR1206FTR500 maintains electrical equivalence in resistance, tolerance, temperature coefficient, and current sense application. However, it differs in package size (1206 vs. 0402), power rating (0.5W vs. 0.125W), and composition (thick film vs. metal film). These differences require circuit-level evaluation for mechanical fit and thermal performance.

Parameter Comparison

Engineering Selection Recommendations

The CSR1206FTR500 serves as an electrical equivalent for the RL-1005-2-R500-FNH based on matching resistance, tolerance, temperature coefficient, and current sense application. Both components maintain ROHS3 compliance and unlimited moisture sensitivity rating.

Selection of CSR1206FTR500 requires evaluation of the following factors:

• Package Size Change: The 1206 package (3.05mm × 1.55mm) is significantly larger than the 0402 package (1.00mm × 0.50mm), requiring PCB layout modification and potential impact on board density.
• Power Rating Increase: The 0.5W rating of CSR1206FTR500 exceeds the 0.125W requirement of the original part, providing thermal margin but increasing component footprint.
• Composition Difference: Transition from metal film to thick film composition may affect frequency response and noise characteristics in precision measurement circuits.
• Temperature Range Extension: The CSR1206FTR500 supports operation to 155°C, exceeding the original -55°C to 125°C range.
• Active Product Status: CSR1206FTR500 is actively manufactured, ensuring long-term availability compared to the obsolete RL-1005-2-R500-FNH.

Frequently Asked Questions (FAQ)

Q: Can CSR1206FTR500 be used as a direct drop-in replacement for RL-1005-2-R500-FNH?

A: No. While electrically equivalent in resistance, tolerance, and temperature coefficient, the CSR1206FTR500 requires PCB layout modification due to package size difference (1206 vs. 0402). Direct substitution on existing PCBs is not possible without redesign.

Q: What are the key electrical parameters that must match for substitution?

A: Resistance value (500 mOhms), tolerance (±1%), temperature coefficient (±100ppm/°C), and current sense application type must remain constant. These parameters define functional equivalence in the circuit.

Q: Does the power rating difference affect circuit performance?

A: The higher power rating (0.5W vs. 0.125W) of CSR1206FTR500 provides increased thermal capacity and may reduce self-heating effects in high-current applications. Circuit-level thermal analysis is required to confirm suitability for the specific application.

Q: Are there compliance or certification concerns with substitution?

A: Both components maintain ROHS3 compliance and unlimited MSL rating. No compliance barriers exist for substitution from a regulatory standpoint.

Q: How does the composition change from metal film to thick film affect performance?

A: Metal film resistors typically offer lower noise and better frequency response than thick film resistors. Applications requiring precision measurement or high-frequency performance should evaluate the composition change against specific circuit requirements.

Q: What is the impact of the extended operating temperature range?

A: The CSR1206FTR500 supports operation to 155°C compared to 125°C for the original part. This provides additional thermal margin for high-temperature applications but does not affect substitution suitability for designs operating within the original -55°C to 125°C range.